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| 1 | Black carbon aerosols and their radiative properties in the Pearl River Delta region显示文摘The climatic and environmental effects of atmospheric aerosols are a hot topic in global science community, and radiative properties of the aerosols are one of the important parameters in assessing climatic change. Here we studied the black carbon concentration and absorption coefficient measured with aethalometers, scattering coefficient measured with nephelometers, and single scattering albedo derived at an atmospheric composition watch station in Guangzhou from 2004 to 2007. Our main results are as follows. The data of black carbon concentration and absorption coefficients measured with instruments cannot be directly used until they are measured in parallel with internationally accepted instruments for comparison, calibration, and reduction. After evaluation of the data, the result shows that the monthly mean of BC concentration varies 3.1―14.8 μg·m-3 and the concentration decreases by about 1 μg·m-3 in average over the four years; It is higher in the dry season with a multi-year mean of 8.9 μg/m3 and lower in the rainy season with a multi-year mean of 8.0 μg·m-3; The extreme maximum of monthly mean concentration occurred in December 2004 and extreme minimum in July 2007, and a 4-year mean is 8.4 μg·m-3. It is also shown that monthly mean scattering coefficient derived varies 129 -565 Mm-1, monthly mean absorption coefficient 32-139 Mm-1, and monthly mean single scattering albedo 0.71-0.91, with annual mean values of 0.80, 0.82, 0.79 and 0.84 for 2004, 2005, 2006 and 2007, respectively. Three instruments were used to take simultaneous measurements of BC in PM10, PM2.5, and PM1 and the results showed that PM2.5 took up about 90% of PM10 and PM1 accounted for about 68% of PM2.5, and BC aerosols are mainly present in fine particulates. The variability of BC concentrations is quite consistent between the Nancun station (141 m above sea level) and the Panyu station (13 m above sea level), which are 8 km apart from each other. The concentration in higher altitude station (Panyu) is consistently lower than the lower altitude station (Nancun), and the difference of annual mean is about 4 μg·m-3. | WU Dui MAO JieTai DENG XueJiao TIE XueXi ZHANG YuanHang ZENG LiMin LI Fei TAN HaoBo BI XueYan HUANG XiaoYing CHEN Jing DENG Tao | 2009 | Science China Earth Sciences2009，52，8： | 58 |
| 2 | Regional ozone pollution and key controlling factors of photochemical ozone production in Pearl River Delta during summer time显示文摘An intensive field campaign including measurements from the environmental monitoring network and from two super sites took place in the Pearl River Delta region in summer 2006.Using routinely measured O3 and NOx concentrations,the spatial and temporal variation of O3 and of the total oxidant concentrations was characterized.According to the spatial variability of NO2/NO,the two super sites were found to be representative of polluted urban and downwind suburban conditions.In addition,both sites were located in high O3 regions.In-depth diagnostic of photochemical ozone production processes and their key controlling factors are achieved with an observation-based model(OBM) to gain regional perspectives.Budget analysis and sensitivity model runs show that aldehyde and HONO chemistry had significant impacts on local photochemical ozone production rates.The analysis of calculated Relative Incremental Reactivities shows that photochemical ozone production rates are mainly sensitive to anthropogenic hydrocarbons(HCs) in the polluted urban areas.In the suburban areas,sensitivity to nitrogen oxide(NO) concentrations dominated.Key anthropogenic HCs in both areas are alkenes and aromatics.Significant differences of ozone production efficiencies are identified between the urban and suburban regions,consistent with the OBM diagnosed results. | CHANG ChihChung CHOU C.K.Charles Andreas Wahner | 2010 | Science China Chemistry2010，53，3： | 34 |
| 3 | 珠三角地区秋季臭氧生成敏感性时空变化模拟研究显示文摘应用大气化学在线耦合模式WRF/Chem模式,对发生在珠三角地区秋季臭氧重污染事件进行了模拟.通过敏感性分析,划分臭氧敏感性区域,并研究敏感性区域随时间变化规律与成因.研究发现:在一定的气象条件和污染物排放情况下,VOCs敏感区主要分布在珠三角中心城区及其下风向地区(例如:佛山、中山、江门、珠海、深圳、广州南部以及肇庆南部地区),而NOx敏感区分布在珠三角的上风向郊区(例如:广州北部、惠州).珠三角臭氧敏感区表现出明显的时间变化特征,上午11-12时相较下午14-15时,VOCs敏感区域范围减少,NOx敏感区域范围增加且增幅达51.4%,其变化原因与生物源VOCs排放增加、气团老化、大气稀释扩散增加有关. | 叶绿萌 樊少芬 常鸣 司徒淑娉 王雪梅 | 2016 | 南京大学学报(自然科学版)2016，52，6： | 34 |
| 4 | 增长与收缩——珠三角城市经济韧性的测度与影响因素(英文)显示文摘In the aftermath of the global financial crisis of 2008, China witnessed gradual shrinkage of cities in the Pearl River Delta(PRD). In this study, we introduce the concept of economic resilience to analyse urban growth and shrinkage in the context of a rapidly-urbanising region. Multiple regression analysis is performed to explore the determinants of economic resilience in the PRD. By measuring resistance in the shrinking phase and recoverability in the growing phase in a group of cities in the PRD, this study distinguishes four scenarios and investigates their characteristics from a spatial perspective. The results demonstrate that the financial crisis had a severe and asymmetric influence on this area, indicating more than 15% of cities are faced with shrinking. The spatial distribution of economic resilience indicates a centre-periphery pattern, that is, high economic resilience in the inner ring and low economic resilience in the outer ring of the PRD. The service economy is found to play a significant role in promoting urban economic resilience. Results imply that sound economic policies for enhancing resilience: both poor local financial status and a high degree of export concentration adversely impact resistance, while upgrading the manufacturing economy and stimulating of industrial innovation are conducive to improve recoverability. | 杜志威 张虹鸥 叶玉瑶 金利霞 徐茜 | 2019 | Journal of Geographical Sciences2019，29，8： | 27 |
| 5 | Logistic模型的参数估计显示文摘自Malthus提出了生物总量增长定律后,Verhulst(1838)提出了Logistic模型,本世纪20年代由Pearl&Reed重新发现了该模型后,其应用日益广泛。其中,其参数估计方法更是人们关注的焦点。迄今为止,已提出了多种不同的估计方法,归纳起来有三类:线性化方法;优化方法及其它。本文便通过数据资料(t1,y1),(t2,y2)……,(tN,yN)分别介绍Logistic模型y或f(7θ,t)=K/[1+exp(a—rt)]的不同参数估计方法。 | 章元明 盖钧镒 | 1994 | 西南农业大学学报(社会科学版)1994，，2： | 23 |
| 6 | HYDRAULICS OF COMPOUND CHANNEL WITH VEGETATED FLOODPLAINS显示文摘Experimental researches were conducted on flood carrying capacity of compound open channels with wide and narrow floodplains as well as hydrodynamic behavior of overbank flow across vegetated floodplains. Results show that hydrodynamic behavior of compound channels with narrow floodplains is different from that of the wide floodplains. In such compound channels with narrow vegetated floodplains as in the Pearl River delta nework, it has been found that vegetated domains become really impenetra ble when the length of vegetated domain is larger than Lm, the length of f low in floodplain coming into the main channel, and that the influence of vegeta ted floodplains upon flood stages of a channel is not very significant. | Huang Ben-sheng, Lai Guan-wen, Qiu Jing, Lin Shu-zhong (Guangdong Research Institute of Water Conservancy & Hydro-Power, Guangzhou 510610, China | 2002 | Journal of Hydrodynamics2002，14，1： | 21 |
| 7 | Heavy metal concentrations in edible bivalves and gastropods available in major markets of the Pearl River Delta显示文摘Molluscs are able to accumulate heavy metals and impose health hazard to consumers. The main objective of the present study is to investigate the heavy metal concentrations in edible bivalves and gastropods available in major markets of the Pearl River Delta. Fourteen species of edible molluscs were purchased from six markets in Hong Kong and Guangdong Province. The fresh of these biota were tested for their cadmium (Cd), copper (Cu), zinc (Zn), lead (Pb), nickel (Ni), chromium (Cr), antimony (Sb) and tin (Sn) concentrations (based on wet weight). The results indicated that amongst the 14 edible molluscs, only Cd, Pb, Ni, Cr, Sb and Sn concentrations in three species ( Ruditapes philippinarum, Perna viridis and Hemifusus tuba ) were within the local regulatory limits. Over 60% of bivalve species exceeded maximum permitted levels of Cd (2 μg/g) and Cr (1 μg/g), while over 40% of gastropod species exceeded the maximum levels of Sb (1 μg/g) and Cr (1 μg/g). Most of the samples collected from Hong Kong had significantly higher contents of Pb and Sb, but similar levels of Cd, Cu and Zn when compared with samples collected across the border ( p <0 05; p <0 01; p <0 001 respectively). In general, the molluscs purchased in Guangdong markets had higher metal contents than those purchased from the Hong Kong markets. When compared with the Provisional Tolerable Weekly Intake or Maximum Acceptable Daily Load recommended by FAO/WHO Expert Committee on Food Additives, Cd levels of five species ( Anadara ferruginea, Pinna pectinata, Chlamys nobilis, Babylonia lutosa and Hemifusus terntanus ) and Cr levels of seven species ( Anadara ferruginea, Paphia undulata, Pinna pectinata, Babylonia lutosa, Hemifusus terntanus, Cymbium melo and Cipangopaludina chinensis ) were higher than both the human daily acceptable limits (for Cd and Cr respectively) and the local regulatory levels (for Cd and Cr respectively). | FANG Zhan-qiang CHEUNG R.Y.H. WONG M.H. | 2001 | Journal of Environmental Sciences2001，13，2： | 20 |
| 8 | PEAR1基因多态性对长期服用阿司匹林脑梗死患者复发的影响显示文摘目的探讨血小板内皮聚集受体1(platelet endothelial aggregation receptor 1,PEAR1)基因多态性与脑梗死患者长期服用阿司匹林复发的相关性。方法对114例初发脑梗死后长期(≥1a)服用阿司匹林的患者,根据入组时是否脑梗死复发分为复发组(21例)与无复发组(93例),使用PEAR1基因芯片检测系统对2组患者的PEAR1基因型进行检测。结果 114例患者PEAR1检出GG、GA、AA三种基因型,其中野生型GG占50.9%,突变型GA占42.1%,AA占7.0%;复发组野生型GG频率明显低于无复发组(23.8%vs.57.0%,P<0.01),复发组纯合突变型AA的频率明显高于无复发组(28.6%vs.2.1%,P<0.01);2组GA频率无明显差异(47.6%vs.40.9%,P>0.05)。复发组年龄、吸烟、LDL-C、糖尿病比例明显偏高,差异有统计学意义(P<0.05)。Logistic回归分析显示,PEAR1基因变异与脑梗死复发显著相关(P=0.006)。结论 PEAR1基因变异与长期服用阿司匹林脑梗死卒中复发相关,PEAR1基因纯合突变增加脑梗死复发的风险。 | 李建设 孟轲 赵剑婷 马玉龙 车振勇 | 2017 | 中国实用神经疾病杂志2017，20，20： | 14 |
| 9 | Magnetic properties of sediments from the Pearl River Delta,South China:Paleoenvironmental implications显示文摘Magnetic parameters and their environmental implications of sediments in a core (PD) from the Pearl River Delta, South China, indicate that ferrimagnetic minerals with low coercivity, such as magnetite, dominate the magnetic properties although small amounts of Fe-sulphides occur. The fraction of Fe-sulphides increases and becomes the dominant minerals determining the magnetic characteristics in grey-black organic-rich clay horizons, indicating an anoxic, sulphate-reducing swamp environment resulting from a marine regression. In the 'Huaban clay' , hard magnetic minerals, such as hematite and goethite, largely control the magnetic properties of the sediments and imply a long period of exposure and weathering. Where magnetite is the main magnetic mineral, its fraction and grain size determine properties such as magnetic susceptibility (κ ) and saturation isothermal remanent magnetization (SIRM). Ratios of SIRM/κ and χarm/SIRM reflect changes in sea level with high SIRM/κ and χarm/SIRM correlating with a smaller magnetic mineral grain size and rising sea level. Based on downcore variations of these environmental magnetic parameters along with sediment characteristics and microfauna, the sedimentary environment of the Pearl River Delta area can be divided into two main cycles of transgression and regression during the late Pleistocene and Holocene with more sub-cycles of sea level fluctuation during each transgression. | Rodney GRAPES | 2008 | Science China Earth Sciences2008，51，1： | 13 |
| 10 | 浅析《红字》的象征意义显示文摘分析了《红字》中红字'A'丰富而深刻的内涵,指出作者通过塑造'小珠儿'的形象,增强了美与丑,善与恶的对比,寄托了作者对爱的绝对自由的向往。 | 张文思 | 2009 | 长春工程学院学报(社会科学版)2009，10，1： | 13 |
| 11 | The impact of climate change and human activities on streamflow and sediment load in the Pearl River basin显示文摘This paper uses monthly streamflow, suspended sediment concentration, and meteorological data to examine the impact of human activity and climate change on streamflow and sediment load in the Pearl River basin from the 1950s to the 2000s. The influences of climate change and human activities on hydrological processes were quantitatively evaluated using the Mann–Kendall abrupt change test and power rating curves. The results showed that:(1) abrupt changes and turning points in streamflow occurred in 1963, 1983, and 1991 which were found to be consistent with global ENSO events and volcanic eruptions. However, abrupt changes in sediment load showed significant spatial differences across the Pearl River basin. For the Xijiang River, an abrupt change in sediment load occurred in 2002, and after 2007 the change becomes significant at the 95% confidence level. At Beijiang and Dongjiang, abrupt changes in sediment load occurred in 1998 and 1988, respectively.(2) The time series of sediment load data was divided into four periods according to abrupt changes. The contribution of climate change and human activities is different in the different rivers. For the Xijiang River, compared with the first period, climate change and human activities contributed 83% and 17%, respectively, to the increasing sediment load during the second period. In the third period, the variation of sediment load followed a decreasing trend. The contribution from climate change and human activities also changed to t236% and -136%, respectively. In the fourth period, climate change and human activities contributed -32% and t132%, respectively. Meanwhile, For the Beijiang River, climate change and human activities contributed 90% and 10% in the second period, the contribution of climate change increased to t115% and human activities decreased to -15% in the third period. In the fourth period, the value for climate change decreased to t36% and human activities increased to t64%. For the Dongjiang River, the contribution of human activities was from 74.5% to 90%, and the values for climate change were from 11% to 25%. Therefore, the effect of human activity showed both spatial and temporal differences, and it seems likely that the decreased sediment load will continue to be controlled mainly by human activities in the future. | Chuangshou Wu Changchen Ji Benwei Shi Yaping Wang Jianhua Gao Yang Yang Jinbin Mu | 2019 | International Journal of Sediment Research2019，34，4： | 12 |
| 12 | A gradient analysis on urban sprawl and urban landscape pattern between 1985 and 2000 in the Pearl River Delta, China显示文摘Urbanization is an irreversible trend world- wide,especially in rapidly developing China.Accelerated urbanization has resulted in rapid urban sprawl and urban landscape pattern changes.Quantifying the spatiotemporal dynamics of urban land use and landscape pattem not only can reveal the characteristics of social transfer and economic development,but also can provide insights into the driving mechanisms of land use changes.In this study,we integrated remote sensing (RS),geographic information system (GIS),landscape metrics,and gradient analysis to quantitatively compare the spatiotemporal dynamics of land use,urban sprawl,and landscape pattern for nine cities in the Pearl River Delta from 1985-2000. For the whole study region,urbanization was obvious.The results show an increase in urban buildup land and shrinkage of cropland in the Pearl River Delta.However, the nine cities differed greatly in terms of the process and magnitude of urban sprawl for both the spatial and temporal dimensions.This was most evident for the cities of Guangzhou and Shenzhen.Gradient analysis on urban landscape changes could deepen understanding of the stages of urban development and provide a scientific foundation for future urban planning and land management strategies in China. | Erfu DAI Zhuo WU Xiaodian DU | 2018 | Frontiers of Earth Science2018，12，4： | 8 |
| 13 | Crustal Structure Revealed by a Deep Seismic Sounding Profile of Baijing-Gaoming-Jinwan in the Pearl River Delta显示文摘The Pearl River Estuary area, located in the middle part of the southern China coastal seismic belt, has long been considered a potential source of strong earthquakes above magnitude 7.0. To scientifically assess the potential strong earthquake risk in this area, a three-dimensional artificial seismic sounding experiment, consisting of a receiving array and seabed seismograph, was performed to reveal the deep crustal structure in this region. We used artificial ship-borne air-gun excitation shots as sources, and fixed and mobile stations as receivers to record seismic data from May to August 2015. This paper presents results along a line from the western side of the Pearl River Estuary to the western side of the Baijing-Gaoming-Jinwan profile. A two-dimensional velocity structure was constructed using seismic travel-time tomography. The inversion results show that the Moho depth is 27 km in the coastal area and 30 km in the northwest of the Pearl River Estuary area, indicating that the crust thins from land to sea. Two structural discontinuities and multiple low-velocity anomalies appear in the crustal section. Inside both discontinuity zones, a low-velocity layer, with a minimum velocity of 6.05 km s^(-1), exists at a depth of about 15 km, and another, with a minimum velocity of 6.37 km s^(-1), exists at a depth of about 21.5 km between the middle and lower crust. These low velocities suggest that the discontinuities may consist of partly molten material. Earthquakes with magnitudes higher than 5.0 occurred in the low-velocity layer along the profile. The deep Kaiping-Enping fault, rooted in the crust, may be one of the most important channels for deep material upwelling and is related to tectonic movement since the Cretaceous in the Pearl River Delta tectonic rift basin. | ZHANG Xiang YE Xiuwei LV Jinshui SUN Jinlong WANG Xiaona | 2018 | Journal of Ocean University of China2018，17，1： | 8 |
| 14 | Offshore Fault Geometrics in the Pearl River Estuary,Southeastern China:Evidence from Seismic Reflection Data显示文摘The Pearl River Estuary(PRE) is located at the onshore-offshore transition zone between South China and South China Sea Basin, and it is of great significant value in discussing tectonic relationships between South China block and South China Sea block and seismic activities along the offshore active faults in PRE. However, the researches on geometric characteristics of offshore faults in this area are extremely lacking. To investigate the offshore fault distribution and their geometric features in the PRE in greater detail, we acquired thirteen seismic reflection profiles in 2015. Combining the analysis of the seismic reflection and free-air gravity anomaly data, this paper revealed the location, continuity, and geometry of the littoral fault zone and other offshore faults in PRE. The littoral fault zone is composed of the major Dangan Islands fault and several parallel, high-angle, normal faults, which mainly trend northeast to northeast-to-east and dip to the southeast with large displacements. The fault zone is divided into three different segments by the northwest-trending faults. Moreover, the basement depth around Dangan Islands is very shallow, while it suddenly increases along the islands westward and southward. These has resulted in the islands and neighboring areas becoming the places where the stress accumulates easily. The seismogenic pattern of this area is closely related to the comprehensive effect of intersecting faults together with the low velocity layer. | CAO Jinghe XIA Shaohong SUN Jinlong ZHAO Fang WAN Kuiyuan XU Huilong | 2018 | Journal of Ocean University of China2018，17，4： | 8 |
| 15 | 珠三角城市空间绿化形式与植物配置的调查显示文摘通过对广州、东莞、深圳市的部分开放公园、住宅小区花园和道路的空间绿化应用形式与植物配置的调查,结果表明:珠三角城市空间绿化应用方式多集中在棚架式、凉廊式、篱垣式、附壁式、立柱、树干绿化、立交桥绿化;空间绿化应用较多的植物有:薜荔、锦屏藤、爬山虎、常春藤、美国凌霄、金银花、茑萝、牵牛、炮仗花、勒杜鹃、紫藤、使君子、绿萝、合果芋、大花老鸭嘴、铺地锦竹草、禾雀花、龙吐珠等;应用垂吊绿化的植物不多,还有待加强推广。 | 庾富文 周俊辉 苏萼怀 李明英 | 2010 | 江西农业学报2010，22，10： | 6 |
| 16 | Impact of clean air action on PM2.5 pollution in China显示文摘China suffers from severe air pollution in the past decades,characterized by high-levels of fine particulate matter(PM2.5)concentrations.To mitigate PM2.5 pollution,the Chinese government issued the Air Pollution Prevention and Control Action Plan(referred to as the Clean Air Action hereinafter)in 2013,which requires the three key regions,ie..,Beijing-Tianjin-Hebei(BTH),the Yangtze River Delta(YRD)and the Pearl River Delta(PRD),to reduce PM2.5 concentrations by 15-25%from 2013-2017,and all other cities to reduce PM10 concentrations by 10%compared to 2012(State Council of the People's Republic of China,2013). | Qiang ZHANG Guannan GENG | 2019 | Science China Earth Sciences2019，62，12： | 6 |
| 17 | Hic74,a novel alanine and glycine rich matrix protein related to nacreous layer formation in the mollusc Hyriopsis cumingii显示文摘Organic matrix proteins play an important role in the biomineralization of mollusc shells.We have identified and characterized a novel matrix protein,namely hic74,isolated from the mantle of the freshwater mussel Hyriopsis cumingii.The hic74 gene encodes a 850 amino acid protein that is rich in alanine(ala,30.8%),glycine(gly,25.8%)and serine(ser,10.6%),with ala mainly existing in poly-ala forms within the ala/gly-rich regions.Quantitative PCR expression analysis demonstrated that hic74 was specifically amplified from the mantle and in situ hybridization showed a strong signal in the epithelial cells in the pallial region of the mantle.Lower levels of expression were detected during the early stages of pearl sac formation but increased and remained constant during nacreous layer formation suggesting that hic74 might be involved in this process. | Xiaojun Liu Can Jin Leiming Wu Shaojian Dong Shimei Zeng Jiale Li | 2017 | Aquaculture and Fisheries2017，2，3： | 6 |
| 18 | Temporal and Spatial Variations of Abundance of Phycocyaninand Phycoerythrin-Rich Synechococcus in Pearl River Estuary and Adjacent Coastal Area显示文摘Three surveys were carried out in Pearl River Estuary and adjacent coastal area in May, August, and November, 2013, to investigate the temporal and spatial variations of abundance of phycoerythrin-rich Synechococcus(PE-rich SYN) and phycocyanin-rich Synechococcus(PC-rich SYN). The effects of environmental factors on the alternation of the different Synechococcus groups were also elucidated. PE-rich SYN was detected in three surveys, whereas PC-rich SYN was detected in May and August, but not in November. The highest abundances of PE-rich SYN and PC-rich SYN were recorded in August and May, with mean values of 74.17×103 and 189.92×103 cells m L-1, respectively. From May to November, the relative abundance of PE-rich SYN increased, whereas that of PC-rich SYN declined. PE-rich and PC-rich SYN presented similar horizontal distributions with high abundance in the southern estuary in May, and in the western estuary in August. The abundances of PE-rich and PC-rich SYN were high at 27–32℃and salinity of 10–20. PC-rich SYN was not detected at < 24℃, and PC:PE-rich SYN decreased in abundance with salinity increase. When less than 20 mg L-1, suspended particulate matter(SPM) was helpful for Synechococcus growth. PE-rich SYN decreased in abundance when the concentration of dissolved inorganic nitrogen increased in May and November, and the concentration of phosphate increased in November. However, PC-rich SYN abundance and nutrients showed no correlation. Principal component analysis and regression analysis indicated that PE-rich SYN significantly correlated with the principal components that were affected by environmental factors. | JIANG Tao CHAI Chao WANG Jifang ZHANG Ling CEN Jingyi LU Songhui | 2016 | Journal of Ocean University of China2016，15，5： | 6 |
| 19 | Comparative Study on the Antioxidant Activity of Peptides from Pearl Oyster(Pinctada martensii) Mantle Type V Collagen and Tilapia(Oreochromis niloticus) Scale Type Ⅰ Collagen显示文摘In this study, Pearl oyster mantle type V collagen(POMC) and tilapia scale type I collagen(TSC) were extracted and hydrolyzed by various proteases in order to obtain peptides. The antioxidant activity of the peptides was investigated by DPPH, hydroxyl radical scavenging experiments and a dynamic digestion model in vitro. The results show that there are significant differences in amino acid composition between POMC and TSC. The collagen peptides obtained from pearl oyster mantle(POMCP) by treating with alkaline protease exhibited higher antioxidant activity than that from tilapia scale(TSCP) treated with papaya protease, and both of them showed greater DPPH and hydroxyl radical scavenging activity than other peptides. After being separated via Sephadex G-25 chromatography, the M1 fraction isolated from POMCP, and the S1 fraction from TSCP with which both had higher molecular weights showed the strongest antioxidant activity than other fractions, and the M1 fraction exhibited stronger antioxidant activity than the S1 fraction in scavenging free-radicals and protecting cells from the oxidation damage. Furthermore, after treating the dynamic digestion system model in vitro, the DPPH and hydroxyl radical scavenging activity of the M1 fraction increased slightly. These results suggest that POMCP exhibits stronger antioxidant activity than TSCP, which means that PMOP may be a good candidate to be a potential natural antioxidant in the food-processing industry. | XIA Guanghua ZHANG Xueying DONG Zhenghua SHEN Xuanri | 2017 | Journal of Ocean University of China2017，16，6： | 6 |
| 20 | Analysis of spatio-temporal pattern and driving force of land cover change using multi-temporal remote sensing images显示文摘Landuse and land cover change is regarded as a good indicator that represents the impact of human activities on earth’s environment.When the large collection of multi-temporal satellite images has become available,it is possible to study a long-term historical process of land cover change.This study aims to investigate the spatio-temporal pattern and driving force of land cover change in the Pearl River Delta region in southern China,where the rapid development has been witnessed since 1980s.The fast economic growth has been associated with an accelerated expansion of urban landuse,which has been recorded by historical remote sensing images.This paper reports the method and outcome of the research that attempts to model spatio-temporal pattern of land cover change using multi-temporal satellite images.The classified satellite images were compared to detect the change from various landuse types to built-up areas.The trajectories of land cover change have then been established based on the time-series of the classified land cover classes.The correlation between the expansion of built-up areas and selected economic data has also been analysed for better understanding on the driving force of the rapid urbanisation process.The result shows that,since early 1990s,the dominant trend of land cover change has been from farmland to urban landuse.The relationship between economic growth indicator(measured by GDP)and built-up area can well fit into a linear regression model with correlation coefficients greater than 0.9.It is quite clear that cities or towns have been sprawling in general,demonstrating two growth models that were closely related to the economic development stages. | ZHOU QiMing & SUN Bo Department of Geography,Hong Kong Baptist University,Hong Kong,China | 2010 | Science China(Technological Sciences)2010，53，S1： | 6 |
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